24.........The Me.109 was compared with a fully operational Spitfire XIV and it was found that the Spitfire possessed an advantage in speed of 25 m.p.h. at heights up to 16,000 feet (the rated altitude of the Me.109), at which height the advantage was reduced to 10 m.p.h. Above 16,000 feet the advantage of the Spitfire XIV increases progressively with altitude, being 50 m.p.h faster at 30,000 feet.

25.........When both aircraft are at 16,000 feet (the rated altitude of the Me.109), there is little to choose between the climbing performance of the two aircraft, but at all other heights the Spitfire has a very pronounced advantage in rate of climb. When both aircraft are put into a dive with engine throttled back and then put into the climbing attitude their rate of climb is identical, but when using maximum power in the dive and subsequent climb the Spitfire very easily leaves the Me.109 behind.

26.........Comparitive dives show that the Me.109 possesses a slight initial advantage, but this advantage is lost at speeds in excess of 380 I.A.S.

Turning circle
27.........The Spitfire has no difficulty in out-turning the Me.109 in either direction, but this advantage is more marked when turning to the right, this being due to the greater power of the Griffon engine at full throttle and further by the fact that the airscrews are revolving in opposite directions.

Rate of Roll
28.........In the rolling plane the Spitfire again is superior at all speeds.

29.........In every aspect of performance the Spitfire is superior.

Note: Only that section of the report pertaining to the Spitfire XIV is reproduced here.

[Main] [Spitfire Mk XIV]